14.20 Chapter 2. Second order differential equations. Section 2.14, The method of elimination for systems. Excercises page 258

14.20.1 problem 1
14.20.2 problem 2
14.20.3 problem 3
14.20.4 problem 4
14.20.5 problem 5
14.20.6 problem 6
14.20.7 problem 7
14.20.8 problem 8
14.20.9 problem 9
14.20.10 problem 10
14.20.11 problem 11
14.20.12 problem 12